linux-kernel - Re: yield() in i2c non-happy paths hits BUG under -rt patch

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Message-ID: <alpine.LFD.2.00.0911191421450.24119@localhost.localdomain>
Date:	Thu, 19 Nov 2009 14:22:59 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Peter Zijlstra <peterz@...radead.org>
cc:	Jean Delvare <khali@...ux-fr.org>,
	Leon Woestenberg <leon.woestenberg@...il.com>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	Sven-Thorsten Dietrich <sven@...bigcorporation.com>,
	linux-i2c@...r.kernel.org,
	rt-users <linux-rt-users@...r.kernel.org>,
	"Ben Dooks (embedded platforms)" <ben-linux@...ff.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: yield() in i2c non-happy paths hits BUG under -rt patch

On Thu, 19 Nov 2009, Peter Zijlstra wrote:

> On Thu, 2009-11-19 at 14:11 +0100, Thomas Gleixner wrote:
> > > You say "NOOP by default", does this imply there is a way to change
> > > this?
> > 
> > There is a sysctl: sysctl_sched_compat_yield 
> 
> This makes yield() place current behind all other tasks, and sucks too
> for some workloads.

yield() sucks anyway, so it depends which flavour of suckage you
prefer.

    tglx
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